Perhaps you should try some spelling variations:
"dung thu triet snippets" » "dung tu triet snippets", "dung su triet snippets", "dung cau triet snippets", "ung thu triet snippets", "dung phu triet snippets", "dung thi triet snippets", "dung thu triet slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung thu triet snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung thu triet snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung thu triet snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung thu triet snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.